This is the first 1,000 characters of 3219 words (12.88 pages) in the essay titled Lung Cancer1
Lung cancer is not just one disease but rather a group of diseases. All forms of cancer
cause cells in the body to change and grow out of control. Most types of cancer cells form
a lump or mass called a tumor. Cells from the tumor can break away and travel to other
parts of the body where they can continue to grow. This spreading process is called
metastasis. When cancer spreads, it is still named after the part of the body where it
started. For example, if breast cancer spreads to the lungs, it is still breast cancer, not lung
cancer. Another word for cancerous is malignant, so a cancerous tumor is referred to as
malignant. But not all tumors are cancer. A tumor that is not cancer is called benign.
Benign tumors do not grow and spread the way cancer does. They are usually not a threat
to life. A few cancers, such as blood cancers (leukemia), do not form a tumor. Most
cancers are named after the part of the body where the cancer first starts. Lung can...
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